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annotate packages/language/c/libc/stdio/current/src/common/streambuf.cxx @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 6ed91473a1cd
children d2c90368aeef
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1 //===========================================================================
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2 //
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3 // streambuf.cxx
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4 //
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5 // C library stdio stream buffer functions
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6 //
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7 //===========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
115
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40 //===========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): jlarmour
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44 // Contributors:
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45 // Date: 2000-04-20
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46 // Purpose:
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47 // Description:
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48 // Usage:
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //===========================================================================
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53
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54 // CONFIGURATION
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55
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56 #include <pkgconf/libc_stdio.h> // Configuration header
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57
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58 // Include buffered I/O?
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59 #if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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60
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61
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62 // INCLUDES
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63
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64 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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65 #include <cyg/infra/cyg_ass.h> // Assertion support
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66 #include <errno.h> // Cyg_ErrNo
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67 #include <stdlib.h> // malloc() and free()
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68 #include <cyg/libc/stdio/streambuf.hxx> // header for this file, just in case
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69
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70 // FUNCTIONS
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71
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72 Cyg_ErrNo
208
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73 Cyg_StdioStreamBuffer::set_buffer( cyg_ucount32 size,
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74 cyg_uint8 *new_buffer )
115
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75 {
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76
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77 #ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
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78
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79 // user-supplied buffer?
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80 if (new_buffer != NULL) {
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81 CYG_CHECK_DATA_PTR(new_buffer, "new_buffer not valid");
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82 #ifdef CYGSEM_LIBC_STDIO_SETVBUF_MALLOC
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83 // first check if we were responsible for the old buffer
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84 if (call_free) {
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85 free(buffer_bottom);
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86 call_free = false;
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87 }
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88 #endif
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89 buffer_bottom = new_buffer;
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90 }
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91 #ifdef CYGSEM_LIBC_STDIO_SETVBUF_MALLOC
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92 else if ( size != buffer_size ) { // as long as its different from
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93 // what we've got now
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94 cyg_uint8 *malloced_buf;
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95
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96 malloced_buf = (cyg_uint8 * )malloc( size );
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97 if (malloced_buf == NULL)
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98 return ENOMEM;
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99
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100 // should the old buffer be freed? This waits till after we know
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101 // whether the malloc succeeded
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102 if (call_free)
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103 free( buffer_bottom );
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104
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105 buffer_bottom = malloced_buf;
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106
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107 call_free=true;
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108
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109 } // else if
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110 #else
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111 // Here we have not been given a new buffer, but have been given
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112 // a new buffer size. If possible, we just shrink what we already
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113 // have.
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114 else if( size > buffer_size )
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115 return EINVAL;
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116 #endif
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117
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118 #else // ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
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119
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120 // In this config we can't use a different buffer, or set a
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121 // size greater than now. We can pretend to shrink it though
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122
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123 // Note on the next line we compare it with the size of static_buffer
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124 // and not the current size, as that's what is the limiting factor
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125 if ( (new_buffer != NULL) || (size > sizeof(static_buffer)) )
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126 return EINVAL;
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127
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128 #endif // ifdef CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
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129
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130 buffer_top = current_buffer_position = &buffer_bottom[0];
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131 buffer_size = size;
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132
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133 return ENOERR;
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134
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135 } // set_buffer()
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136
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137
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138 #endif // if defined(CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO)
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139
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140
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
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141 // EOF streambuf.cxx